Search found 101 matches
- Sun Mar 14, 2021 9:52 pm
- Forum: Ideal Gases
- Topic: Temperature
- Replies: 99
- Views: 5583
Re: Temperature
Yup! It would be 25 degrees C in that case.
- Sun Mar 14, 2021 9:51 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: catalyst's effect on equilibrium
- Replies: 9
- Views: 731
Re: catalyst's effect on equilibrium
A catalyst would just lower the activation energy of a reaction.
- Sun Mar 14, 2021 9:50 pm
- Forum: Ideal Gases
- Topic: Standard temperature
- Replies: 10
- Views: 648
Re: Standard temperature
It would be 298K so SATP!
- Sun Mar 14, 2021 9:50 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 57
- Views: 2997
Re: K and Q
So, both are constants but K will only be equal to Q when the reaction is at equilibrium. This is because Q can be the constant at any point, but K has to be the constant at equilibrium.
- Sun Mar 14, 2021 9:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridges
- Replies: 41
- Views: 2788
Re: Salt Bridges
Salt bridges help to prevent the buildup of charges by allowing for the transfer of electrons.
- Sun Mar 14, 2021 9:47 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cells vs. Concentration Cells
- Replies: 5
- Views: 441
Re: Galvanic Cells vs. Concentration Cells
As other people said, the galvanic cell operates with two different compounds and an oxidation/reduction reaction. A concentration cell would be the same compound and flow due to a concentration gradient.
- Sun Mar 14, 2021 9:44 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: R constant
- Replies: 6
- Views: 406
Re: R constant
Typically, to determine what value of R to use, you look at the units being used. In this scenario, R would equal 8.314 J/(Kmol)!
- Sun Mar 14, 2021 9:43 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E naught
- Replies: 13
- Views: 713
Re: E naught
E naught is equal to 0 at equilibrium.
- Sun Mar 14, 2021 9:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridges
- Replies: 12
- Views: 785
Re: Salt Bridges
Salt bridges help to prevent the build-up of charges on either side by allowing the transfer of electrons.
- Sun Mar 14, 2021 9:41 pm
- Forum: General Rate Laws
- Topic: Collision theory
- Replies: 7
- Views: 699
Re: Collision theory
Collision theory basically states that in order for gas particles to interact with one another they collide. With increasing temperatures, there is an increase in chaos and kinetic energy so the rate of the reaction will increase as well.
- Sun Mar 14, 2021 9:40 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 4449
Re: Factors Affecting k
The rate constant, k, can change due to a change in temperature.
- Thu Mar 04, 2021 9:53 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E vs E naught
- Replies: 36
- Views: 1442
Re: E vs E naught
E naught is just the value of E at standard conditions!
- Thu Mar 04, 2021 3:52 pm
- Forum: Van't Hoff Equation
- Topic: Delta H naught VS delta H
- Replies: 28
- Views: 2228
Re: Delta H naught VS delta H
ΔH° actually represents ΔH at standard conditions, while ΔH represents the change in enthalpy.
- Thu Mar 04, 2021 3:51 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff equation
- Replies: 13
- Views: 1384
Re: Van't Hoff equation
I believe the Van't Hoff equation is most applicable when given two different temperatures and attempting to solve for K at one of the two temperatures. Hope that makes sense!
- Thu Mar 04, 2021 3:49 pm
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 20
- Views: 893
Re: Half life
The equation for half-life, as mentioned in the lecture, would be t1/2=[A]0/2k!
- Thu Mar 04, 2021 3:47 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Instantaneous Rate
- Replies: 41
- Views: 1920
Re: Instantaneous Rate
As time proceeds, the instantaneous rate will decrease. It approaches 0 as equilibrium is approached
- Thu Mar 04, 2021 3:41 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Isolated System
- Replies: 16
- Views: 867
Re: Isolated System
An isolated system means that energy or matter cannot be changed, however, there may be internal aspects of the system that are affected.
- Thu Mar 04, 2021 3:40 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 8303
Re: Vapor vs gas
I believe for the purposes of this class we can consider their properties and phase the same.
- Thu Mar 04, 2021 3:37 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 9245
Re: Endothermic v. Exothermic
Yes, it is true. Exothermic reactions will always have a negative delta H and endothermic reactions will always have a positive delta H. This is how you can distinguish between the two!
- Thu Mar 04, 2021 3:31 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Temperature vs. activation energy
- Replies: 33
- Views: 2349
Re: Temperature vs. activation energy
Yes an increase in temperature will lead to an increase in K because it causes an increase in collisions.
- Thu Mar 04, 2021 3:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 19
- Views: 658
Re: Salt Bridge
A salt bridge essentially allows for the continuous flow of electrons and prevents the build-up of charges
- Thu Mar 04, 2021 3:23 pm
- Forum: Balancing Redox Reactions
- Topic: states of matter
- Replies: 58
- Views: 2065
Re: states of matter
Yes, for the sapling questions they did want us to list the states of matter in order to get the questions correct!
- Mon Feb 15, 2021 9:47 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Meaning of K
- Replies: 55
- Views: 3606
Re: Meaning of K
K when used as a unit is likely referring to Kelvin. But, in problems regarding equilibrium constants, K is the equilibrium constant.
- Mon Feb 15, 2021 9:44 am
- Forum: Calculating Work of Expansion
- Topic: Ideal gas constant
- Replies: 9
- Views: 744
Re: Ideal gas constant
You choose the R-value based on the units you are working with. You would want the units to match up!
- Mon Feb 15, 2021 9:43 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: higer molar entropy
- Replies: 13
- Views: 563
Re: higer molar entropy
Low pressures indicate higher volumes, while higher pressures indicate lower volumes. This is an inverse relationship. With greater volume, there are higher values of entropy!
- Mon Feb 15, 2021 9:41 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 5
- Views: 268
Re: Van't Hoff Equation
I think the derivation just helps you to comprehend the equation, but you do not need to know how to do it. Memorizing it is probably your best bet!
- Mon Feb 15, 2021 9:40 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Free Energy
- Replies: 49
- Views: 1809
Re: Free Energy
For a state function, the path taken does not matter. You look solely at the final and initial values.
- Mon Feb 15, 2021 9:38 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Strong Acids/Bases
- Replies: 19
- Views: 1205
Re: Strong Acids/Bases
The one on sapling under chempendix is also the one I've been referring to. They honestly become a lot easier to recognize after you consistently do practice problems with them!
- Mon Feb 15, 2021 9:37 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert gas
- Replies: 25
- Views: 1461
Re: Inert gas
Inert gases do not react, so it does not cause a shift in the equilibrium of a system.
- Mon Feb 15, 2021 9:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc
- Replies: 36
- Views: 1183
Re: K vs. Kc
Kc is basically just a more specific term for K. It helps you distinguish between when you're using Kp or Kc. One is for pressure while the other is for concentration values.
- Mon Feb 15, 2021 9:34 am
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 6982
Re: Chem BL
I'm also planning on taking 14BL with 14C. I've heard that's pretty common.
- Mon Feb 15, 2021 9:33 am
- Forum: Ideal Gases
- Topic: Units for K
- Replies: 29
- Views: 1053
Re: Units for K
I believe that since K is a ratio, the units cancel out and you are just left with the value!
- Sun Jan 31, 2021 5:00 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 9245
Re: Endothermic v. Exothermic
Yes, you'll find that exothermic reactions will always have a negative delta H while endothermic reactions will always have a positive delta H. This is due to the fact that heat is either being released or absorbed.
- Sun Jan 31, 2021 4:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table, when to divide by L
- Replies: 5
- Views: 155
Re: ICE table, when to divide by L
Dividing by the amount of L helps you find molarity. If you're given the concentration of something in moles, you want to divide it by L to use molarity when doing your ICE table calculations.
- Sun Jan 31, 2021 4:52 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Explaining Le Chatelier's Principle
- Replies: 14
- Views: 933
Re: Explaining Le Chatelier's Principle
In essence, Le Chatlier's Principle explains that when a system experiences a disturbance it will work to overcome that disturbance and restore the system to a state of equilibrium.
- Sun Jan 31, 2021 4:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: is HClO3 weak or strong? [ENDORSED]
- Replies: 49
- Views: 3855
Re: is HClO3 weak or strong? [ENDORSED]
I believe HClO3 would be considered a strong acid.
- Sun Jan 24, 2021 6:55 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Total Pressure
- Replies: 26
- Views: 1759
Re: Total Pressure
The total pressure is found by adding up all partial pressures at equilibrium!
- Sun Jan 24, 2021 6:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Ice Tables
- Replies: 28
- Views: 924
Re: Ice Tables
I was confused about this too! I think as mentioned in other replies, the best way of going about it is checking to see which side has an initial concentration and which side does not. You can assign a -x to the side that has an initial concentration.
- Sun Jan 24, 2021 6:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Difference between K and Kc
- Replies: 13
- Views: 572
Re: Difference between K and Kc
Kc and Kp are more specific versions of K. K on its own is representative of the equilibrium constant. Adding a subscript to it just lets you specify.
- Sun Jan 24, 2021 6:35 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature
- Replies: 45
- Views: 1243
Re: Temperature
This would depend on whether the rxn is exothermic or endothermic. You would be asked in relation to this.
- Sun Jan 24, 2021 6:33 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert Gases and Le Chatelier's Principle
- Replies: 6
- Views: 465
Re: Inert Gases and Le Chatelier's Principle
The addition of an inert gas would actually not affect the equilibrium! It doesn't affect the pressure of other gases so long as the volume remains unchanged. Changing the volume would increase/decrease pressure, but simply the addition of the inert gas would have zero effect.
- Sun Jan 17, 2021 3:06 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Strong vs Weak Acids and Bases
- Replies: 7
- Views: 222
Re: Strong vs Weak Acids and Bases
I've heard that memorizing strong acids are your best bet. There aren't too many and it's easy to google a list of them!
- Sun Jan 17, 2021 3:05 am
- Forum: Ideal Gases
- Topic: Gas constant R
- Replies: 26
- Views: 1025
Re: Gas constant R
R is a constant that is = 8.3144598 J/mol·K
- Sun Jan 17, 2021 3:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 26778
Re: Accessing the E-textbook [ENDORSED]
Kaleb Tuliau 3E wrote:Pretty sure that Sapling is mandatory, and will actually be collected midnight of the following Sunday, however, is this the only "homework" due??
Yes, I believe Sapling is the only mandatory homework. Professor Lavelle gives us textbook problems as well but those problems are not graded.
- Sun Jan 17, 2021 3:01 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Using Ka vs Kb
- Replies: 8
- Views: 443
Re: Using Ka vs Kb
Hey! As Hannah said, I believe Ka is used when dealing with the formation of acids while Kb is used when dealing with the formation of bases.
- Sun Jan 17, 2021 3:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table and Molarity units
- Replies: 18
- Views: 698
Re: ICE table and Molarity units
I think starting with molarity is just the easiest thing to do so that you arent concerned with units later on.
- Sun Jan 17, 2021 2:59 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Box
- Replies: 28
- Views: 1114
Re: ICE Box
I believe the ICE box is best used on weak acids and bases! However, you can use it on strong acids and bases as well, it would just be a longer process.
- Sun Jan 10, 2021 11:53 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: adding heat
- Replies: 15
- Views: 458
Re: adding heat
Adding heat allows the activation energy to lower, thus resulting in a quicker reaction.
- Sun Jan 10, 2021 11:52 pm
- Forum: Ideal Gases
- Topic: Equation Constant
- Replies: 5
- Views: 165
Re: Equation Constant
When you add a constant you make the equations equal to one another, however, the absence of that constant would make them proportional instead of equal.
- Sun Jan 10, 2021 11:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Favors
- Replies: 10
- Views: 436
Re: Favors
If a reaction favors a certain side, it is creating more reactants going towards that given side.
- Sun Jan 10, 2021 11:48 pm
- Forum: Ideal Gases
- Topic: Units for Pressure
- Replies: 41
- Views: 2330
Re: Units for Pressure
I believe units of pressure should be in atm.
- Sun Jan 10, 2021 11:48 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3215
Re: Units of Temperature
You should use Kelvin!
- Tue Dec 15, 2020 6:38 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for CH2
- Replies: 4
- Views: 5981
Re: Lewis Structure for CH2
I believe a lone pair would go on the carbon, therefore resulting in a bent shape.
- Tue Dec 15, 2020 6:35 pm
- Forum: *Titrations & Titration Calculations
- Topic: Acid/Base bonds
- Replies: 5
- Views: 824
Re: Acid/Base bonds
Strong acids have weaker bonds (long bonds).
- Tue Dec 15, 2020 6:32 pm
- Forum: Naming
- Topic: Latin names
- Replies: 10
- Views: 618
Re: Latin names
We use latin names for anions!
- Tue Dec 15, 2020 6:30 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 13
- Views: 870
Re: Atomic Radius
The ion with the larger radius would be the ion that has a less positive charge, in this case, Fe2+.
- Tue Dec 15, 2020 6:10 pm
- Forum: Sigma & Pi Bonds
- Topic: Pi Bonds
- Replies: 18
- Views: 715
Re: Pi Bonds
Just covalent bonds.
- Tue Dec 15, 2020 6:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What are the bond angles for T shaped?
- Replies: 21
- Views: 8295
Re: What are the bond angles for T shaped?
90 degree bond angles!
- Sun Dec 13, 2020 10:23 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Titration Graphs
- Replies: 6
- Views: 299
Re: Titration Graphs
I would review them! I think knowing the different slopes it could have depending on what kind of acids and bases you mix could be important.
- Sun Dec 13, 2020 10:06 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Ka and pKa
- Replies: 5
- Views: 437
Re: Ka and pKa
Higher Ka values indicate lower pKa values and lower Ka values indicate higher pKa values if I'm not mistaken.
- Sun Dec 13, 2020 10:05 am
- Forum: Conjugate Acids & Bases
- Topic: Amphoteric
- Replies: 11
- Views: 457
Re: Amphoteric
Amphoteric compounds are characterized by their ability to act as both acids and bases! H2O is a great example.
- Sun Nov 29, 2020 10:16 pm
- Forum: Trends in The Periodic Table
- Topic: Ion Trends
- Replies: 28
- Views: 1238
Re: Ion Trends
Atomic radius, electronegativity, and ionization energy are probably important ones to know! There are periodic tables that you can look up online with trends outlined on them.
- Sun Nov 29, 2020 10:13 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 16
- Views: 734
Re: Electron Affinity
Atoms to right would have a higher electron affinity.
- Sun Nov 29, 2020 10:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic radius
- Replies: 18
- Views: 749
Re: Ionic radius
I believe an ion will have a larger radius the more negative it becomes, while the smaller ions will be more positive. But I think there isn't a guaranteed correlation.
- Sun Nov 29, 2020 10:04 pm
- Forum: Bond Lengths & Energies
- Topic: Higher Melting Point
- Replies: 28
- Views: 2439
Re: Higher Melting Point
Because CHl3 is larger, it has stronger forces that make it harder to melt.
- Sun Nov 29, 2020 10:03 pm
- Forum: Coordinate Covalent Bonds
- Topic: Hydrogen Bonding
- Replies: 7
- Views: 497
Re: Hydrogen Bonding
In order to form a hydrogen bond, there must be hydrogen present!
- Sun Nov 29, 2020 10:02 pm
- Forum: Properties of Light
- Topic: Study Advice
- Replies: 50
- Views: 2007
Re: Study Advice
I feel like doing the UA worksheets really helps me to prepare for the content on the tests!
- Sun Nov 29, 2020 10:00 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 12
- Views: 479
Re: Sig Figs
I think the general rule is to use the number of significant figures that are in the problem you're looking at!
- Sun Nov 29, 2020 9:51 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling/Melting Point
- Replies: 29
- Views: 1102
Re: Boiling/Melting Point
If a compound has higher intermolecular forces then its boiling point will be higher!
- Sun Nov 29, 2020 9:43 pm
- Forum: Octet Exceptions
- Topic: Aluminum bonding
- Replies: 5
- Views: 275
Re: Aluminum bonding
Aluminum typically forms 3 bonds, similar to Boron.
- Sun Nov 29, 2020 9:42 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and Pi Bonds
- Replies: 24
- Views: 991
Re: Sigma and Pi Bonds
It contains both a sigma and pi bond within a double bond so I believe that is why you refer to it as a pi bond.
- Sun Nov 29, 2020 9:40 pm
- Forum: Sigma & Pi Bonds
- Topic: Rotation
- Replies: 16
- Views: 820
Re: Rotation
Yes. A sigma bond is present in a single bond while a double bond has a sigma and pi bond. A triple bond has a sigma and two pi bonds.
- Sun Nov 29, 2020 9:37 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 11
- Views: 575
Re: Resonance
Structures with formal charges closest to zero will be the most stable.
- Sun Nov 29, 2020 9:33 pm
- Forum: Octet Exceptions
- Topic: Expansion for 3s?
- Replies: 4
- Views: 174
Re: Expansion for 3s?
No, atoms in 3s do not use the d orbital.
- Sun Nov 29, 2020 9:25 pm
- Forum: Electronegativity
- Topic: determining electronegativity
- Replies: 40
- Views: 5389
Re: determining electronegativity
I think you should just be aware of its trend, it increases as you move up and to the right of the periodic table.
- Sun Nov 08, 2020 11:08 pm
- Forum: Octet Exceptions
- Topic: Lewis Acid and Lewis Base
- Replies: 7
- Views: 330
Re: Lewis Acid and Lewis Base
Lewis bases donate electrons while the lewis acids will accept them.
- Sun Nov 08, 2020 11:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 16
- Views: 906
Re: Electronegativity
Fluorine is highly reactive because it only requires 1 electron to reach stability.
- Sun Nov 08, 2020 11:03 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 Study Group
- Replies: 25
- Views: 964
Re: Midterm 2 Study Group
I'd love to join in!
- Sun Nov 08, 2020 11:02 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 22
- Views: 1186
Re: Bond Length
They are found experimentally!
- Sun Nov 08, 2020 11:01 pm
- Forum: Lewis Acids & Bases
- Topic: Acid vs. Base
- Replies: 8
- Views: 385
Re: Acid vs. Base
I think we'll receive further details on this in lectures to come!
- Mon Nov 02, 2020 12:01 am
- Forum: Trends in The Periodic Table
- Topic: ionic radius
- Replies: 14
- Views: 369
Re: ionic radius
Hey! I believe that cations have the smallest ionic radius, while anions have the largest.
- Mon Oct 26, 2020 11:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: Is ionic or covalent stronger?
- Replies: 31
- Views: 15152
Re: Is ionic or covalent stronger?
Ionic is stronger according to my understanding!
- Mon Oct 26, 2020 11:11 pm
- Forum: Photoelectric Effect
- Topic: Mass of atoms
- Replies: 18
- Views: 532
Re: Mass of atoms
The mass of the atoms should be in kilograms because it is the SI unit for mass.
- Mon Oct 26, 2020 11:10 pm
- Forum: Trends in The Periodic Table
- Topic: Electronegativity
- Replies: 11
- Views: 627
Re: Electronegativity
Just keep in mind that electronegativity increases up a group and to the right across a period!
- Mon Oct 26, 2020 11:08 pm
- Forum: Student Social/Study Group
- Topic: How are you studying?
- Replies: 204
- Views: 16964
Re: How are you studying?
I'm trying to relisten to lectures and work through the textbook problems!
- Mon Oct 26, 2020 11:07 pm
- Forum: Lewis Structures
- Topic: Bent or Angular?
- Replies: 18
- Views: 1021
Re: Bent or Angular?
I believe they can be used interchangeably.
- Mon Oct 26, 2020 11:06 pm
- Forum: Photoelectric Effect
- Topic: Wavelength in Photoelectric Effect
- Replies: 7
- Views: 301
Re: Wavelength in Photoelectric Effect
I believe that the difference depends on the type of metal being used.
- Mon Oct 26, 2020 11:03 pm
- Forum: Electronegativity
- Topic: Periodic Table Trend
- Replies: 40
- Views: 2109
Re: Periodic Table Trend
They will both increase across a period and also decrease down a group!
- Mon Oct 26, 2020 11:01 pm
- Forum: Ionic & Covalent Bonds
- Topic: Strength of bonds
- Replies: 13
- Views: 548
Re: Strength of bonds
I've heard that covalent bonds are the strongest types of bonds!
- Sun Oct 18, 2020 9:06 pm
- Forum: Significant Figures
- Topic: What is the purpose of significant figures?
- Replies: 17
- Views: 1028
Re: What is the purpose of significant figures?
I'm pretty sure it just has to do with accuracy and precision according to what I looked up. They use sig figs in physics as well.
- Sun Oct 18, 2020 9:05 pm
- Forum: Significant Figures
- Topic: sig fig
- Replies: 20
- Views: 908
Re: sig fig
I usually don't convert to significant figures until the very end, but I'm not completely sure!
- Sun Oct 18, 2020 9:03 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Emitting a Photon
- Replies: 9
- Views: 230
Re: Emitting a Photon
Yes, as the electron goes from high to normal energy I believe a photon is emitted. But since all of the energy will be emitted once it reaches a normal state no more photons should be released.
- Sun Oct 18, 2020 9:01 pm
- Forum: Trends in The Periodic Table
- Topic: Period Trends
- Replies: 11
- Views: 475
Re: Period Trends
There is also a trend with the atomic radius! It tends to decrease across a period and then increase down a group.
- Sun Oct 18, 2020 9:00 pm
- Forum: Photoelectric Effect
- Topic: In a Vacuum
- Replies: 7
- Views: 143
Re: In a Vacuum
To my understanding, without the vacuum, the particles would not be controlled and collide with the electrons.
- Sun Oct 18, 2020 6:43 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 410840
Re: Rusty on High School Chem [ENDORSED]
I'm also nervous about not knowing anything from high school chem. I'm hoping the step-up session will prove to be useful!
- Sun Oct 18, 2020 6:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 3471
Re: Where can I buy a webcam for a reasonable price?
Is a webcam actually required for our exams???
- Thu Oct 08, 2020 10:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 158963
Re: How to find my posts
Hello professor, I posted a question to chemistry community yesterday however I am unsure how to check to see if anyone has replied to it or how to find my original question. I was wondering if you could tell me. Thank you. I've been overwhelmed trying to figure out how to navigate this channel too...
- Tue Oct 06, 2020 10:21 pm
- Forum: Balancing Chemical Reactions
- Topic: Periodic Table
- Replies: 66
- Views: 4585
Re: Periodic Table
Ke Huang 2G wrote:Do we need to memorize both the name and the symbol of elements for the Periodic Table? Will the Periodic Table on the tests provide us the names?
I don't think we need it memorized, but it will probably be helpful to become familiarized with the Table and know how to interact with it.
- Tue Oct 06, 2020 10:18 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Sapling HW Question 5
- Replies: 10
- Views: 341
Re: Sapling HW Question 5
Calculate the percent composition by mass of each element in NaClO3. Na= 14.37% Cl= 36.38% O= 49.25% These are my answers for question 5 but it's incorrect. I solved by dividing the molar mass of each element over the molar mass of the whole molecule, then changing it to a percentage, so I don't kn...
- Tue Oct 06, 2020 10:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6499
Re: Step Up Sessions
t_rasul3I wrote:Can I just join any UA peer learning session?
From my understanding, yes. You can just pop into any session and it's okay if you can't attend for the entire time frame.